Extensible support for scaffolding



UNITED STATES PATENT rrr-cn,

GEORGE J. REXROTH, OF NAPOLEON, OHIO.

EXTENSIBLE. SUPPORT FOR SCAFFOLDING.

SPECIFICATION forming part of Letters PatentrNo. 59(1,7'74, dated September 28, 189'?. Application filed January 23, 1897. Serial No. 620,365. (No model.)

To @ZZ whom z5 may concern:

Be it known that I, GEORGE J. REXROTH, of Napoleon, county of Henry, and State of Ohio, have invented certain new and useful Improvements in an Extensible Support for Scaffolding; and I do hereby declare that the following is a full, clear, and exact descript-ion of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the iigures of reference marked thereon, which form part of this specification.

My invention relates to an extensible support for scaffolding, and has for its object to provide a base with the requisite supportability, having a tubular fixed standard in which is telescoped an extensible standard having secured upon its upper end a support for the scaffolding with a swinging brace having a bifurcated rest to engage and be supported upon the Vtelescopic standard or the fixed tubular base and adjusted as to height by encircling rings having means for security at any point of adjustment.

Afurther object is to provide novel meansv for elevating the movable standard and securing the same in any desired adjustment.

A further object is to provide a novel form of elevating as well as-holding ring for use in the adjustment of thevertically-adjustable standard. I

In the drawings, Figure 1 is an elevation of a support for scaffolding constructed in accordance with my invention, in which the full lines show the scaffolding extended with the pivoted brace supported upon a supporting-ring and in dottedlines showing the support lowered with the brace-support upon a `holding-ring upon the base-standard. Fig. 2

is a plan view of the elevating supportingrings employed in the elevation and support of the vertically-movable standard. Fig. 3 is a longitudinal vertical section showing the base standard with the vertical movable standard telescoped therein and the lever and elevating-ring in full and dotted lines to disclose their positions in the elevation or return movement, respectively, in raising the telescopic standard and also in full and dotted lines the holding-ring in its movement in allowing the ascent and preventing the descent of the telescopic section. Fig. 4is a sectional detail view showing a preferred construction of the interior annular biting surface of the elevating and holding-rings, respectively.

The object of my invention is to provide a scaffolding-support ofthe properadjustability to render it useful by reason of its adjustability for use in rooms of different heights, or in the'event of the erection of buildings to be adaptable to a vertical adjustment in the erection of the walls, my feature being that of ease of elevating the scaffold-support and the security of its support within the vertical standard.

1 designates a base upon which is mounted a tubular standard 2, having an enlarged tubular area 3. The standard 2 is of an interior diam eter to'allow of free vertical movement of a standard 4, preferably tubular for strength and having upon its upper end a metal plate 5, upon which is supported a scaifold-supporting beam 6, which, as a matter of course, must be horizontal. Beam G is equipped at its outer end with a metalplate 7, having ears 8, between which is journaled a brace 9, having a bifurcated end 10 to embrace standard 4 and be supported thereon'by means of a setscrew 12. The fork 10, as' shown in dotted lines, Fig. 1, is adaptedto also embrace the standard 2 and be supported by a ring 13, adjustable upon the standard 2 and held to any desired adjustment by` a set-screw 14. By this construction, the vertical adjustment of the standard 4 to a degree to cause the brace Qand bifurcated end 10 to be required to be adjusted below the upper end of the standard 2, the brace 9 is swung upon the pivot 8 and adjusted upon thering 13 upon the lower end of the standard 2.

In the means employed in raising the standard 4 within the fixed base-standard 2 I employ an elevating-ring 15, pivotallyiixed vat 16 upon one side of the tube 3 and connected, by means of a link 17, with a lever 18, fulcrumed at 19, so that in the depression of the lever 18 the ring 15 is brought into Obliquity with the standard 4, thereby causing the biting edge 20 to engage with the standard 4, and a further depression of the lever 18, as shown in dotted lines, Fig. 3, will tend to ele vate the standard 4. The standard 4A is held in vertical adjustment by means of a holding- IOC) ring 2l, pivoted, as at 22, to the tube 3 and adapted to assume an inverse obliquity in its depression as the standard 4 is impinged therein in its tendency to depression.

Vhen it is desired to allow the standard to telescope within the standard 2 to lower the support 6, the holding-ring 21 is raised to a right angle with standard 4 by means of a rope or chain B y reference to Fig. 4 it will be seen that I have formed the rings 15 and 21 with a concentric biting edge 20, formed by equal-angled sides from the periphery to the inner circumference, thereby always insuring a quick and positive engagement of the rings with the standard.

In operation, the scaffold-supporting beam 6 being at its lowest position, as shown in dotted lines, Fig. 1, in which the brace 9, with its bifurcated end 10, is supported upon the ring 13, in order to raise the standard 4 and scaffold-supporting beam 6 lever 1S is depressed, thereby pulling upon link 17 and causing ring 15 to assume an oblique position with reference to standard 4, wherebythe biting edge 2O engages with the standard 4 and raises the same to the full extent of the swaying of the lever 18, during which time the holding-ring 21 assumes a position at right angles to the standard 4and allows a vertical rise of the standard 4, whereupon, by the tendency of the standard 4 to vertical depression after the full swaying of the lever 1S and a release thereof, the ring 21 is caused to assume a position in Obliquity to the vertical standard, and the biting edge 20 engages therewith to hold the standard from depression.

It will be seen from the foregoing that I have provided a convenient and positive means for elevating the standard 4 and holding the standard in adjustment, and also that by reason of the pivotal relation of the brace 9 with the scaifold-support 6 and the adjustable rings l2 and 13 I may adjust the scaffolding to compensate for any height of work to be performed.

As an auxiliary support to the standard 4 I provide a`brace 24, having a bifurcated end 25 to engage with the standard 4 and abut against a ring 26, vertically adjustable upon the standard 4 and held to any desired adjustment by means of a set-screw 27, the lower end of the brace 24 resting upon the floor of the building or any other desired fixed support, whereby lateral swaying of the support is prevented.

Vhile I have illustrated but one brace 24, it will be apparent that I may employ a plurality of such braces in order to sustain the standard 4 from swaying in any direction.

' W'hat I claim is- 1. In a scaffold-support, a portable base, a tubular standard iixedly secured thereon, a standard vertically adjustable within the tubular standard having a scaffold-support at right angles, a brace connected with the scaffold-support pivotal and adjustable to rest upon the telescopic standard or the fixed standard with means for holding the same in adjustment. Y

2. In a scaffold-support, a base, a tubular standard secured thereon, an enlarged tubular area, an elevating-ring pivotally secured upon one side of the interior thereof, a link secured with the ring, a lever in which the opposite end of the link is secured,'having a pivotal relation with the enlarged portion of the tube 3, and a holding-ring pivoted within the shell having a flexible medium by which to raise the same, the elevating and holding rings being formed with an annular biting edge respectively.

3. In a scaffolding, a fixed tubular base portion, a telescopic portion, an adjustable ring upon the fixed and telescopic portions, a scaffold-beam secured at right angles to the telescopic section 'having a pivoted brace provided with a bifurcated end and means for adjusting the telescopic portion to cause the bifurcated end of the brace to rest upon either ring as desired.

4. In a scaffold-support, a fixed section and a section telescopically arranged therein with a brace adapted to extend from the base of the fixed section and be supported with relation to the telescopic section, and a ring adjustable upon the telescopic section adapted to rest against the end of the brace and be secured to the telescopic section.

In testimony that I claim the foregoing as my own I hereby affix my signature in presence of two witnesses.

GEORGE J. REXROTH.

fitnesses VILLIAM WEBSTER, MAUD SonUMAci-IER.

IOO 

